<template>
  <el-container>
    <!-- 头部区域 -->
    <el-header>
      <div><img src="@/assets/heima.png" /><span>电商后台管理系统</span></div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 左侧侧边栏 -->
      <el-aside :width="isCollapse === true ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409EEF"
          unique-opened
          :collapse="isCollapse"
          :collapse-transition="false"
          router
          :default-active="activePath"
        >
          <!-- 一级菜单 -->
          <el-submenu
            :index="item.id.toString()"
            v-for="item in menuList"
            :key="item.id"
          >
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{ item.authName }}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item
              :index="'/' + subItem.path"
              v-for="subItem in item.children"
              :key="subItem.id"
              @click="saveNavState('/' + subItem.path)"
              ><template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{ subItem.authName }}</span>
              </template></el-menu-item
            >
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
import { getMenuListApi } from '../../api/home'
export default {
  created () {
    this.getMenuList()
    this.activePath = sessionStorage.getItem('activePath')
  },
  data () {
    return {
      menuList: [],
      iconsObj: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  methods: {
    logout () {
      sessionStorage.removeItem('token')
      this.$router.replace('/login')
    },
    // 获取所有菜单
    async getMenuList () {
      const { data } = await getMenuListApi()
      // console.log(data)
      if (data.meta.status !== 200) return this.$message.error('获取菜单数据失败!')
      this.menuList = data.data
    },
    // 菜单折叠与展开
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.el-container {
  height: 100%;
}
.el-header {
  background-color: #373c41;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-left: 0;
  color: #fff;
  font-size: 20px;
  div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #373c41;
}
.el-main {
  background-color: #eee;
}
.el-menu {
  border-right: none;
}
.iconfont {
  margin-right: 8px;
}
.toggle-button {
  bottom: #4a5064;
  color: #fff;
  font-size: 10px;
  line-height: 24px;
  text-align: center;
  cursor: pointer;
  letter-spacing: 0.2em;
}
</style>
